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Calibration Procedure Teledyne API Model M201E NH
3
Analyzer Operator Manual
16 05206H DCN5910
The first time bottled ammonia is connected to the gas dilution system,
regulator/calibrator, the TNx reading may take a number of hours to
stabilize.
2.1 ZEROING THE ANALYZER
The analyzer can be zeroed by either applying zero air straight to the sample port
or through the optional Zero/Span valves, if installed. It is important to remember
that if the analyzer was previously sampling ammonia gas, prior to conducting a
Zero calibration, it will take some period of time before the zero baseline is
reached. The process of zeroing the analyzer consists of delivering dry zero air
to the analyzer. The operator then manually zeros the TN
x
and NO
x
channels
individually through the user interface. The following Tables outline the steps
necessary to zero the analyzer.
Table 2-1. Zero Calibration Procedure – Zero Gas Through the SAMPLE Port
Important: Each channel (TN
x
and NO
x
) must be zeroed individually
Step No. Action Comment
1. Press CAL The M201E enters the calibrate mode from sample
mode. Confirm zero gas is flowing past the sample
port.
2. Channel Selection Press TN
X
or NO
x
then Press ENTR.
3. Range Selection Press LOW or HIGH range then Press ENTR.
Always calibrate the LOW range, section 3.0 below.
4. NH3 STB Reading Wait for the displayed stability reading to fall below
1.0 PPB. The lower the stability reading the better the
zero value.
5. Press ZERO If you change your mind after pressing ZERO, you
can still press EXIT without zeroing the instrument.
You don’t have to enter concentration values. The
analyzer knows to apply 0 PPB.
6. Press ENTR Pressing ENTR actually adjusts the Offset value fo
r
the selected channel.
7. Press EXIT The M201E returns to sampling mode.
8. Check
Concentrations
/Offsets
All displayed concentrations should read zero. The
offset values should be close to zero (-20 to 150 mv)